Dynamo-electric machine.



No. 854,782. PATENTED MAY 28, 1907. L. E. UNDERWOOD. DYNAMO ELECTRIC MACHINE.

APPLICATION FILED 0CT.24,1906.

WITNESSES \NVENTEIR LEILIIS E UNDER-WUU\ W W b MMH LOUIS E. UNDERWOOD, o F LYNN, MAS

SAOHUSETTS, AssI'eNoR To GENERAL ELEOTRIO'COMPANY, A CORPORATION OF NEW ifORK.

DYNAMIC-ELECTRIC MACHINE.

Speciflcation of Letters Patent.

Application filed October 24,1908. Serial No. 340,307.

To all whom, it may concern;

Be it known that I LoUIs E. UNDER- woon, a citizen of the Ilnited States, residmg at Lynn, county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Dynamo-Electric Machines, of whichthe following is aspecificat1on.'

My invention relates to the construction ofdynamo-electrlc machines and has for its 'objict to improve the same.

the ordmary motor or dynamo wherein a currentecollecting device is placed at one end of the rotating armature, some portion of the machine must be arranged to pro- Thus, oneof the, heads of the machine may be made deeper than the other in the axial dlrectlon' and the current-collecting device housed within this enlarged head; or, if it is desired to have the two heads alike, one end of the field magnet frame may be extended or elongated and the current-collecting device located within. the extended end of the field magnet structure. In the one case'it is necessary to have differently shaped heads on the machine, and in the latter the arm-atur'e cannot be turned end for end when, for

an reason, it is desired to operate the mach ne in that way.

The present invention contemplates a construction and arrangement of parts whereby the heads of the machine may be made identical, if desired, and at the same time the machine may readily be adapted for operation with the armature turned end for end.-

My invention-will be more fully understood and its objects and advantages will be more clearly apparent from the following detailed description taken in connection with the accompanyin drawing which illustrates preferred embodiments ofmy invention.

In said drawing, Figure 1 shows in longitudinal cross-section a motor arran ed in accordance with my invention; and ig. 2

, is a view partly in side elevation and partly in longitudinal section of a further modification.

I Referring to Fig. 1 of the drawing, 1 represents a field magnet frame having integral therewith polar projections 2, preferabl arranged mldway between the ends 0 the frame; 3 are energizing coils of any usual with respect to the field coil type surrounding the polarpro'ections. 4 are pole-pieces or pole tips. so ormed that their pole faces are displaced or ofi'set axially of the machine with respect to the polar projections; this displacement permltting the armature to bearranged unsymmetrically s so that space is'provided within the field frame and two Patented May 28, 1907.

similar heads for both the armature and commutator. The. amount of dis lacement is therefore dependent upon the ength of the commutator." The polar tips may be secured to the polar projections in any suitable manner, as by means of screws 5. 6 and 7 are the motor heads, they being alike in all respects. 8 and 9 are the armature and the commutator, respectively, these being supported in the usual manner upon a shaft 'ournaled in bearings 10 and 11 in the motor eads. The armature, it will be seen, is arranged within one end of the field frame and the commutator within the other; the pole faces of the field magnet structure being so situated as to produce the proper magneticfield for the armature.

When it is desired to run the motor with the armature turned end for end, the bolts 5 are loosened and the pieces 4 are turned through an angle of 180; whereupon, when the armature and commutator have ex changed places so that the armature is on the left-hand end of the machine and the commutator on the right-hand end, (as'in Fig. 2) the armature and the pole faces are in exactly the same relative positions as before. Each head of the motor is preferably provided with suitable means for receiving the brush holders as, for example, they may each have a boss 12 about which the supporting rin 13 for the brush holders maybe clamped. nstead of. making the polar projections integral with the frame and providing detachable pieces or tips, these members may be made integral with-each other but detachable from the main frame, as at 14 in Fi 2. In this case, of course, the whole po e-piece must be rotated when the position of the armature is reversed in the manner dequired for the commutator may be provided in the mdtor-heads,each head furnishing one half 'of the total amount.

Although I have illustrated only the best forms of my invention now known to me, I do not desire to be limited to these particular forms, since in its broader. aspects the invention may P be embodied various other forms as will be evident. from the appended claims.

What I claim as new "and desire to secure by Letters Patent of the United States, is:

1. In a dynamo-electric machine, a field magnet frame having an offset pfiglar portion, an means for permitting said polar portion to be adjusted axially of the machine into a.

plurality of positions.

2. I magnet frame provided with a pole piece having an offset portion provided with a pole face, and means for securing the parts together so that the pole face mabe displaced axially of the machine in eit er direction with respect to the pole-piece.

3. In a dynamo-electric machine, a field magnet frame provided with an energizing coil havin its axis in a plane transverse-to theaxis o the machine, and a pole member constructed and'arranged so as to be placed in operativerelationto said coil with its pole face displaced axially of the machine. in either direction from said plane.

4. In a dynamo-electric machine, afield magnet. structure, and a pole piece detachable from said structure, said pole piece be-' ing constructed and arranged to be secured in-position with its pole face displaced'axially in, either direction withrespect to the axis of the pole piece.

5. In a dynamo-electric machine, a field n a dynamo-electric machine, a field tioned on eitherside oftlie'plane of the body portions of the. pole iecesv 7. In a dynamo-e I tric machine, a field, ma net frame, excit" coils on said frame,'. an

polar projections aving pole'faces arranged to be positioned seas, to displace the pole faces axially with respect to the'coils and in either direction.

8-. In a dynamo-electric machine,-a field magnet structure, energizin coils having axes transverse-to the axis 0 the machine pole pieces having offset pole faces, and means for securing said pole pieces so as to locate the pole faces on either side of the axes of the coils.

9. In a dynamo-electric machine, a field magnet structure having detachable olar portions provided with aterally-dis aced pole faces, means for securing the sai polar portions in place so as to bring the pole faces. in eitherextreme position axially of the machine, an armatureand current-collecting device, and means for supporting the armature and current-collecting device in either end for end relationdepending upon the position of the pole faces.

10. In a dynamo-electric machine, a field magnet structure, similar heads at the ends of said structure, hearings in saidheads for an armature shaft, an armature having a curthereof, polar portions having pole faces, and means for securing said polar portions to the field magnet structure with the ole faces arranged m. either of two axia ly-displaced planes depending upon the end for end relation of the armature and current collecting device in the machine.

11. In a dynamo-electric machine, a field magnet frame having a luralit of detachable polar portions provi ed wit pole faces, and means for securing said polar portions in place so as to bring the pole faces into either of a plurality of axially-displacedpositions.

- rent-collecting device "arranged at one end In witness whereof, I have hereunto set my hand this twenty-second day of October, 1906.

LOUIS 11. UNDERWOOD.

Witnesses: JOHN A. MCMANUS, Jr., PHILIP Fv HARRINGTON. 

